SPOT, OR SPOT DISEASE. 1 67 



no case must the diseased leaves be thrown into 

 the walk or behind the pipes to rot and spread 

 the fungus. When a leaf is badly affected it is 

 best to remove it entirely, but when there are 

 only a few spots on a leaf, these can be pinched or 

 cut out and the rest of the leaf saved. 



It is folly to postpone this work, for every day 

 adds to the chances against getting the disease 

 under control. We do not advocate the applica- 

 tion of any fungicide. We have tried many 

 things, including Bordeaux mixture, lime, sulphur, 

 ammoniacal solution of copper carbonate, etc., 

 but have never yet found any good evidence that 

 they are beneficial. 



In addition to the strictest attention in keep- 

 ing the plants clean, no effort should be spared to 

 furnish the best conditions for growth. Attend 

 rigidly to watering, ventilating, and firing. Keep 

 all water from the foliage, for wherever the leaves 

 stay wet for "seventeen to twenty hours succes- 

 sively spot is pretty sure to develop. From the 

 twentieth of August until the twentieth of Novem- 

 ber is the period in which spot is most to be feared 

 and watched. If the plants can be successfully 

 brought through this period they are practically 

 safe, unless unusual conditions arise. 



From what has been said it will be seen how 

 important it is to have the plants where they will 

 at all times be under control. In frames and in 

 fields this is practically impossible, as there they 



